1. They’ve been around for a very, very long time.
The oldest known sea turtle fossils date back about 150 million years, making them some of the oldest creatures on Earth. Just for some context, dinosaurs became extinct 65 million years ago:

7. And for the new hatchlings, it really is survival of the fittest.
It is estimated that only one hatchling in a thousand will make it to adulthood. Whether it's the treacherous journey from nest to ocean or the predatory dangers of the open sea, it’s a cruel, cruel world out there for these youngsters:

8. Male sea turtles spend their entire lives at sea.
Since they don’t have to return to land to lay eggs, males almost never leave the ocean. This can make it difficult to keep track of population numbers.

9. Sometimes they cry, but not because they’re sad.
Sea turtles have glands that help to empty excess salt from their eyes, making it appear as though they’re crying, but not to worry, they're just doing some spring cleaning: